\documentstyle[12pt,a4]{article}
\title{Tape format }
\author{G.Zehnacker}
\date{Edition 1.0\\Octobre 1990}
\begin{document}

\begin{titlepage}
{

\hoffset=1truein
\hsize=5.25truein
\vsize=10.25truein
\font\small=cmssbx10 at 14.4truept
\font\medium=cmssbx10 at 17.28truept
\font\large=cmssbx10 at 20.74truept
\hrule height 0pt
\parindent=0pt
%\parskip=0pt
\hskip 3.9truein
\large
EDOC108\par
\vskip .5truein
\large
Projet EUROGAM\par
\vskip 1.5truein
\hrule height 2pt
\vskip 20pt
\large
Tape format\par
\vskip .5truein
\small
standard eurogam\par
\vskip 20pt
\hrule height 2pt
\vskip 1truein
\medium
Edition 1.4\par
\vskip 3pt
18 janvier 1991\par
\vfill
\small
G.ZEHNACKER\par
\vskip 30pt
\medium
SATD du Centre de Recherches Nucl\'{e}aires \par
\vskip 5pt
CNRS-IN2P3 France\par
\vskip 5pt

}
\end{titlepage}  


\section{Introduction}

	The 'Tape Standard'  for  'Eurogam ' is based on the ANSI standard .  
We propose it with the variable format D and the special structured data block .  
	

\section{Volume and file header label}

	The blocks VOL1, HDR1, HDR2, EOF1 , EOF2 and data file blocks should be written by the Data Acquisition software or by others softwares ( which save or restore data on/from  the tape from/to  memory or disk ). Other labels defined by the standards (
as UHLn and UTLn) should not be used.'

\subsection{general structure }

\begin{itemize}
\item a initialised tape contains :
\item	VOL1 **
\item a tape with files contains:
 :
\item	VOL1 HDR1 HDR2 *  --- file --- * EOF1 EOF2 **
\end{itemize}

nota1 : the file is definited later 

nota2 : * represents a 'tape mark'

\subsection{block structure}

\paragraph{'Volume label' VOL1}

\begin{itemize}
\item1-4   : identifier set to VOL1
\item5-10  : volume name(6 characters)
\item11-37 : spaces
\item38-51 : user name( 14 characters ou spaces)
\item52-79 : spaces
\item80    : version 3 of the standard norme
\end{itemize}

\paragraph{'file header 1' set to HDR1} 
\begin{itemize}
\item1-4   : identifierHDR1
\item5-21  : file name ( 1 a 8 characters ) 
\item22-27 : the  volume name ( the same as in VOL1
\item28-31 : 0001 ( in ASCII )
\item32-35 : file number ; begin with 1 then  increase  1 with each file
\item36-39 : generation number 0001
\item40-41 : version number set to 0
\item42-47 : date file creation ' yyddd'  ('yy' is the  year , 'ddd ' day number
\item48-54 : spaces  
\item55-60 : 000000
\item61-73 : system code spaces
\item74-80 : spaces
\end{itemize}

\paragraph{'file header 2' HDR2} 
\begin{itemize}
\item1-4   : identifier set to HDR2
\item5     : variable  format = D
\item6-10  : maximun number of characters per blocks;  8192 bytes  
\item11-15 : length record  - should be same as block length ( 8192 bytes) 
\item16-50 : spaces
\item51-52 : set to 00
\item53-80 : spaces
\end{itemize}

\paragraph{'end file header 1' EOF1} 
\begin{itemize}
\item1-4   : identifier set to EOF1
\item5-54  : same that HDR1 
\item55-60 : number of blocks in the file ( between 2 tapes marks )
\item61-80 : spaces
\end{itemize}

\paragraph{'end file header 2' set to EOF2} 
\begin{itemize}
\item1-4   :  end file header 2 EOF2
\item5 -80 :  same that HDR2
\end{itemize}

\subsection{'data block structure } 	
	the  blocks allow to  :
\begin{itemize}
\item 1-4     : block length in ASCII less than or equal  8192 bytes 
\item 5-12    : type of data bloc : FILEH,EVENTH,EVENTD,SPECTH,SPECTD,COMMENT
\item 13-20   : block counter in  ASCII
\item 21-end  : the specific 'data' 
\end{itemize}

   A data file allow  every kind of  blocks  .
\paragraph{'type of data bloc'}:
\begin{itemize}
\item FILEH   for file definition
\item COMMENT for comments, 
\item SCALER  for scaling counter, 
\item PARAM   for different  parameters, 
\item EVENTH  for events header,
\item EVENTD  for events data
\item SPECTH  for spectrum header
\item SPECTD  for spectrum data 
\end{itemize}

\paragraph{'data block'}
\begin{itemize}
\item  a file can contain every spectra with different length
\item  the events blocks must be defined
\item  one logical block in one physical block
\item  for exabyte the length must be 8192 bytes
\end{itemize}

\section{Other general proposals}
\begin{itemize}
\item the file must be monovolume   
\item each ascii field are padded  with trailing space   
\item empty field must be filled with spaces 
\item to decrease the number of tape marks on exabyte , we propose to save many spectra in one file
\end{itemize}


\end{document}